//控制行数
function controlLine(){
	var height=parseInt($(".about-us").css("height"));
	var lineHeight=parseInt($(".about-us").css("line-height"));
	console.log(lineHeight);
	var lineNum=parseInt(height/lineHeight);
	console.log(lineNum);
	if(lineNum>12){
		$(".about-us").addClass("over-hidden");
		$(".about-us").after("<p class='more'>显示更多</p>")
	}
	$(".more").on("click",function(){
		$(".about-us").removeClass("over-hidden");
		$(this).remove();
	})
}
controlLine();